feat(e2e): render direct/recorder/debug/tcplogger/stress sections in the unified report

Extends report_build.py with build_by_kind() (per-scenario-kind pass/fail
rollup) and a ported build_stress()/stress_headline()/stress_plots() (scaling
curves per stress axis), wires both into the headline KPIs, regression
tracking, and report_data.json. E2E_Report.typ renders the four new
per-kind tables plus a Stress Tests section (per-axis case tables + scaling
plots, gracefully degrading to placeholders when a kind/stress data is
absent). run_e2e.sh now passes --stress-results so the report actually
receives real stress data instead of silently omitting it.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Test/E2E/suite/tests_py.py

@@ -85,6 +85,18 @@ class TestScenarios(unittest.TestCase):
         tcplogger_ids = {s["id"] for s in S.SCENARIOS if s["kind"] == "tcplogger"}
         self.assertEqual(tcplogger_ids, {"s56_tcplogger_delivery"})
 
+    def test_build_by_kind_filters_correctly(self):
+        import report_build as R
+        results = {"scenarios": [
+            {"id": "a", "kind": "direct", "status": "PASS"},
+            {"id": "b", "kind": "chain", "status": "PASS"},
+            {"id": "c", "kind": "direct", "status": "FAIL"},
+        ]}
+        d = R.build_by_kind(results, "direct")
+        self.assertEqual(d["n_pass"], 1)
+        self.assertEqual(d["n_fail"], 1)
+        self.assertEqual(d["n_total"], 2)
+
 
 class TestGenData(unittest.TestCase):
     def test_ground_truth_shapes(self):